JP4217846B2 - Granular wettable powder with good storage stability - Google Patents

Description

【００５５】
表−２より、本発明の粒状水和剤は、５０℃で１ケ月間という過酷な条件下で保存した後でも、水中崩壊性と懸濁安定性が良好であることが分かる。また、実施例１と２の比較及び実施例３と４の比較より、ナフタレンスルホン酸ホルマリン縮合物を単独で使用するよりも、リグニンスルホン酸ナトリウムと併用した方が、懸濁安定性が優れることが分かる。
【００５６】
【表１９】

【００５７】
表−３より、本発明の粒状水和剤は、少量の水に希釈した場合でも、懸濁安定性に優れることが分かる。
【００５８】
【発明の効果】
本発明の粒状水和剤は、過酷条件下で保存しても水希釈時の水中崩壊性や懸濁安定性が悪化せず、かつ少量の水に希釈した場合でも分散性や懸濁安定性に優れる。[0001]
[Technical field to which the invention belongs]
The present invention relates to a granular wettable powder having good storage stability.
[0002]
[Prior art]
When formulating a low melting point pesticidal active ingredient into a granular wettable powder, for example, as seen in JP-A-3-163006, the pesticidal active ingredient is heated or dissolved with a solvent to form an oil-absorbing carrier. There is known a method of granulating a mixture containing one or more selected from a water-soluble carrier and a mineral carrier by a wet extrusion granulation method or a dry granulation method. However, this method sometimes causes deterioration in water disintegration and suspension stability when diluted with water over time.
[0003]
Japanese Patent Publication No. 63-38004 discloses a granular wettable powder containing an alkali metal phosphate, a naphthalenesulfonic acid surfactant and a saccharide. In the invention, a condensed phosphate is used as the alkali metal phosphate, but the condensed phosphate has low water solubility, so that the dispersibility of the granular wettable powder in water may not be good.
[0004]
In the past, granular wettable powder was diluted and sprayed in 500 to 2000 times the amount of the formulation. In recent years, the amount of diluted water has been reduced to 1 to 50 times the amount of the formulation from the viewpoint of labor saving in spraying agricultural chemicals. There are attempts to reduce it. However, reducing the amount of diluted water may cause deterioration in suspension stability when diluted with water because the agrochemical active ingredient and other adjuvants are present in a high concentration in the diluted water.
[0005]
[Problems to be solved by the invention]
The present invention provides a granular wettable powder that does not deteriorate in water disintegration and suspension stability when diluted with water over time, and is excellent in dispersibility and suspension stability even when diluted in a small amount of water. It is in.
[0006]
[Means for Solving the Problems]
As a result of various studies to solve the above problems, the present inventors have found that the following granular wettable powder does not deteriorate in water disintegration or suspension stability when diluted with water over time, and a small amount of water. The present invention was completed by finding out that it was excellent in dispersibility and suspension stability even when diluted to a low level. That is, the present invention relates to the following granular wettable powders [1] to [5].
[0007]
[1] A granular wettable powder containing the following (1) to (3).
(1) Agrochemical active ingredient having a melting point of 80 ° C or lower and a solid at 25 ° C
(2) Naphthalenesulfonic acid formalin condensate or sodium lignin sulfonate
(3) Orthophosphate [2] A granular wettable powder containing the following (1) to (3).
(1) Agrochemical active ingredient having a melting point of 80 ° C or lower and a solid at 25 ° C
(2) Naphthalenesulfonic acid formalin condensate and sodium lignin sulfonate
(3) The granular wettable powder according to [1] or [2], wherein the melting point of the pesticidal active ingredient of orthophosphate [3] (1) is 65 ° C. or lower.
[4] The granular wettable powder according to [1] to [3], further containing a sulfonylurea herbicidal active ingredient in addition to the agrochemical active ingredient of (1).
[5] The granular wettable powder according to [1] to [4], wherein the pesticidal active ingredient in (1) is indanophan.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In order to produce the granular wettable powder of the present invention, a necessary amount of a solid raw material is collected, mixed uniformly, and then finely pulverized. The fine pulverization can be performed by a dry pulverizer such as an impact pulverizer, a ball mill, and a jet ohmizer. Next, the required amount of water and the remaining liquid raw material are mixed together with the fine powder obtained above, kneaded, granulated using a granulator, dried and the desired granular hydration Get the agent. Granulation can be performed by a granulator such as an extrusion granulator, a pressure granulator, a fluidized bed granulator, a stirring granulator, a rolling granulator or the like.
[0009]
The agrochemical active ingredient used in the granular wettable powder of the present invention is not particularly limited as long as it has a melting point of 80 ° C. or lower and is solid at 25 ° C., for example, tenylchlor (generic name), methyldymron (general name) Name), dithiopyr (generic name), amiprofos-methyl (generic name), ioxynil octanoate (generic name), cyhalofop butyl (generic name), anilophos (aminophos, anilofos) / Generic name), indanofan (generic name), fentolazamide (generic name), nitrofen (generic name) and the like. In addition, the pesticidal active ingredients having a melting point of 65 ° C. or lower and solid at 25 ° C. include, for example, ioxynil octanoate (common name), cyhalofop butyl (common name), anilophos (aminophos, anilofos / general) Name) and indanofan (generic name).
[0010]
The granular wettable powder of the present invention may contain a sulfonylurea herbicidal active ingredient in addition to the agrochemical active ingredient. For example, pyrazosulfuron-ethyl (generic name), halosulfuron methyl / halosulfuron methyl / (Generic name), bensulfuron methyl (generic name), imazosulfuron (generic name), azimsulfuron (generic name), sinosulfuron (generic name), cyclosulfamuron (generic name) And ethoxysulfuron (generic name).
[0011]
The naphthalenesulfonic acid formalin condensate used in the granular wettable powder of the present invention is a formalin condensate of naphthalenesulfonic acid, a formalin condensate of alkylnaphthalenesulfonic acid, a formalin condensate of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid, and these Specifically, LUNOX 1000C (trade name / manufactured by Toho Chemical Co., Ltd.), New Calgen WG-2 (trade name / manufactured by Takemoto Yushi Co., Ltd.), Tamol NN9401, Tamol NH7519 ( Trade name / BASF Co., Ltd.), Labelin ANL-40, Labelin ANH-40, Labelin W-40 (above, trade name / Daiichi Kogyo Seiyaku Co., Ltd.), Vanillo HDL-100 (Product name / Nippon Paper Industries Co., Ltd.), Demall N, Demole RN, Demole MS, Demole SN-B, Demole C (above, trade name / manufactured by Kao Corporation), Politi N-100 (Product name / Lion ), Suprasil MNS / 90, Suprasil RM / 210-E (trade name, manufactured by Rhône Poulin Co., Ltd.), and the like. Among the naphthalenesulfonic acid formalin condensates, sodium salts of formalin condensates of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid are preferred. The blending amount of the naphthalene sulfonic acid formalin condensate in the preparation is usually 0.5 to 30% by weight, preferably 0.5 to 20% by weight, and more preferably 0.5 to 10% by weight.
[0012]
Specific examples of sodium lignin sulfonate used in the granular wettable powder of the present invention include Sun Extract P-252, Vanillex N, Vanillex RN, Pearllex DP, Pearllex NP (above, trade name / manufactured by Nippon Paper Industries Co., Ltd.) ), Borresperse NA, Ufoxane 2, Ufoxane 3A (above, manufactured by Borregaard LignoTech), Polyphone F, Polyphone H, REAX 100M, Riax 907, Riax 910, craft sparse DD-5, craft sparse DD-8 and craft sparse EDF-350 (above, trade name / manufactured by Westvaco). The amount of sodium lignin sulfonate in the preparation is usually 0.5 to 30% by weight, preferably 0.5 to 20% by weight, and more preferably 0.5 to 10% by weight.
[0013]
Only one of the naphthalene sulfonic acid formalin condensate and sodium lignin sulfonate may be used, but the combined use is preferable because the suspension stability when the granular wettable powder is diluted in water is improved.
[0014]
The orthophosphate used in the granular wettable powder of the present invention has the structure of the formula (1).
[0015]
MaHbPO4 (1)
[M: alkali metal (Li, Na, K) or ammonium (NH4), a: an integer from 1 to 3, b: an integer from 0 to 2 (however, a and b are added to 3)] ortholine Of the acid salts, diammonium hydrogen phosphate is preferred. When a condensed phosphate is used instead of orthophosphate, the water solubility of the condensed phosphate is lower than that of orthophosphate, so that the dispersibility in water of the granular wettable powder is not good and is not suitable for blending. As a compounding quantity in the formulation of orthophosphate, it is 0.5-50 weight% normally, Preferably it is 0.5-40 weight%, More preferably, it is 0.5-30 weight%.
[0016]
In this preparation, as other auxiliary agents, a bulking agent, a disintegration auxiliary agent, a binder, a stabilizer, an antifoaming agent, and the like can be blended as necessary.
[0017]
An antifoaming agent is mix | blended in order to suppress foaming of a dilution liquid, and a silicon type surfactant, a fluorochemical surfactant, etc. can be mentioned. The amount of the antifoaming agent is usually 0.01 to 5% by weight, preferably 0.01 to 3% by weight, and more preferably 0.01 to 1% by weight.
[0018]
The particle size of the granular wettable powder of the present invention is not particularly limited, but is preferably 0.1 to 2 mm.
[0019]
The granular wettable powder of the present invention can be used in paddy fields, upland farming, agricultural lands, non-cultivated lands, etc., regardless of the field of use, but is suitable for spraying on flooded sewage paddy fields after rice planting. The method of spraying is to dilute the granular wettable powder in water and spray the diluted solution. However, if the amount of the diluted water is small, the labor saving of spraying the agricultural chemical can be achieved. Usually, the quantity of dilution water is 1-2000 times with respect to the said granular wettable powder, Preferably, it is 1-100 times, More preferably, it is 1-50 times.
[0020]
Although the combination of the preferable embodiment of this invention is shown in Table-1, this invention is not limited to these. The larger the value of No. in the table, the more preferable combination. The meanings of the abbreviations in the table are as follows.
Nap: naphthalene sulfonic acid formalin condensate, Lig: sodium lignin sulfonate, SU: sulfonylurea herbicidal active ingredient, <80 ° C .: agricultural chemical active ingredient with melting point of 80 ° C. or lower, <65 ° C .: agricultural chemical active ingredient with melting point of 65 ° C. or lower, ○: contained in granular wettable powder, x: not contained in granular wettable powder, (NH4) 2HPO4: diammonium hydrogen phosphate, paddy paddy field: used for paddy field sewage paddy field, 1-50 : Diluted with 1 to 50 times the amount of water with respect to the granular wettable powder and sprayed,-: not particularly limited.
[0021]
[Table 1]
Table-1
―――――――――――――――――――――――――――――――――――
No. Pesticide active ingredient Nap Lig Orthophosphate SU Field of use Diluted water amount ―――――――――――――――――――――――――――――――――――
1 <80 ° C ○ × Orthophosphate × − −
2 <65 ° C ○ × Orthophosphate × − −
2 <80 ° C ○ ○ Orthophosphate × − −
2 <80 ° C ○ × (NH4) 2HPO4 × − −
2 <80 ℃ ○ × Orthophosphate ○ − −
2 <80 ° C ○ × Orthophosphate × Minato Paddy Field −
2 <80 ° C ○ × Orthophosphate × − 1 to 50
3 Indanophan ○ × Orthophosphate × − −
3 <65 ° C ○ ○ Orthophosphate × − −
3 <65 ℃ ○ × (NH4) 2HPO4 × − −
3 <65 ℃ ○ × Orthophosphate ○ − −
3 <65 ℃ ○ × Orthophosphate × Minato Paddy −
3 <65 ° C ○ × Orthophosphate × − 1 to 50
3 <80 ° C ○ ○ (NH4) 2HPO4 × − −
3 <80 ° C ○ ○ Orthophosphate ○ − −
3 <80 ℃ ○ ○ Orthophosphate × Minato Paddy −
3 <80 ° C ○ ○ Orthophosphate × − 1 to 50
3 <80 ℃ ○ × (NH4) 2HPO4 ○ − −
3 <80 ° C ○ × (NH4) 2HPO4 × Minato Paddy Field −
3 <80 ° C ○ × (NH4) 2HPO4 × − 1 to 50
3 <80 ℃ ○ × Orthophosphate ○ Minato Paddy Field −
3 <80 ° C ○ × Orthophosphate ○ − 1 to 50
―――――――――――――――――――――――――――――――――――
[0022]
[Table 2]
Table 1 (continued)
―――――――――――――――――――――――――――――――――――
No. Pesticide active ingredient Nap Lig Orthophosphate SU Field of use Diluted water amount ―――――――――――――――――――――――――――――――――――
3 <80 ℃ ○ × Orthophosphate × Minamata 1 ～ 50
4 Indanophan ○ ○ Orthophosphate × − −
4 Indanophan ○ × (NH4) 2HPO4 × − −
4 Indanophan ○ × Orthophosphate ○ − −
4 Indanophan ○ × Orthophosphate × 湛 Mizuta −
4 Indanophan ○ × Orthophosphate × − 1 to 50
4 <65 ° C ○ ○ (NH4) 2HPO4 × − −
4 <65 ° C ○ ○ Orthophosphate ○ − −
4 <65 ℃ ○ ○ Orthophosphate × Minato Paddy −
4 <65 ° C ○ ○ Orthophosphate × − 1 to 50
4 <65 ℃ ○ × (NH4) 2HPO4 ○ − −
4 <65 ° C ○ × (NH4) 2HPO4 × Minato Paddy Field −
4 <65 ° C ○ × (NH4) 2HPO4 × − 1 to 50
4 <65 ℃ ○ × Orthophosphate ○ Minato Paddy Field −
4 <65 ° C ○ × Orthophosphate ○ − 1 to 50
4 <65 ° C ○ × Orthophosphate × Minamata 1-50
4 <80 ° C ○ ○ (NH4) 2HPO4 ○ − −
4 <80 ° C ○ ○ (NH4) 2HPO4 × Minato Paddy Field −
4 <80 ° C ○ ○ (NH4) 2HPO4 × − 1 to 50
4 <80 ° C ○ ○ Orthophosphate ○ Minato Paddy Field −
4 <80 ° C ○ ○ Orthophosphate ○ − 1 ~ 50
4 <80 ° C ○ ○ Orthophosphate × Minamata 1 ~ 50
―――――――――――――――――――――――――――――――――――
[0023]
[Table 3]
Table 1 (continued)
―――――――――――――――――――――――――――――――――――
No. Pesticide active ingredient Nap Lig Orthophosphate SU Field of use Diluted water amount ―――――――――――――――――――――――――――――――――――
4 <80 ° C ○ × (NH4) 2HPO4 ○ Minato Paddy Field −
4 <80 ° C ○ × (NH4) 2HPO4 ○ − 1 to 50
4 <80 ℃ ○ × Orthophosphate ○ Minato Paddy 1 ~ 50
5 Indanophan ○ ○ (NH4) 2HPO4 × − −
5 Indanophan ○ ○ Orthophosphate ○ − −
5 Indanophan ○ ○ Orthophosphate × Minato Paddy −
5 Indanophan ○ ○ Orthophosphate × − 1 to 50
5 Indanophan ○ × (NH4) 2HPO4 ○ − −
5 Indanophan ○ × (NH4) 2HPO4 × 湛 Mizuta −
5 Indanophan ○ × (NH4) 2HPO4 × − 1 to 50
5 Indanophan ○ × Orthophosphate ○ Minato Mizuta −
5 Indanophan ○ × Orthophosphate ○ − 1 ~ 50
5 Indanophan ○ × Orthophosphate × 湛 Mizuta 1 ~ 50
5 <65 ° C ○ ○ (NH4) 2HPO4 ○ − −
5 <65 ° C ○ ○ (NH4) 2HPO4 × 湛 Mizuta −
5 <65 ° C ○ ○ (NH4) 2HPO4 × − 1 to 50
5 <65 ° C ○ ○ Orthophosphate ○ Minato Paddy Field −
5 <65 ° C ○ ○ Orthophosphate ○ − 1 ~ 50
5 <65 ° C ○ ○ Orthophosphate × Minamata 1-50
5 <65 ℃ ○ × (NH4) 2HPO4 ○ Minato Paddy Field −
5 <65 ° C ○ × (NH4) 2HPO4 ○ − 1 to 50
5 <65 ° C ○ × (NH4) 2HPO4 × 湛 Mizuta 1 ~ 50
―――――――――――――――――――――――――――――――――――
[0024]
[Table 4]
Table 1 (continued)
―――――――――――――――――――――――――――――――――――
No. Pesticide active ingredient Nap Lig Orthophosphate SU Field of use Diluted water amount ―――――――――――――――――――――――――――――――――――
5 <65 ℃ ○ × Orthophosphate ○ Minato Paddy 1 ~ 50
5 <80 ℃ ○ ○ (NH4) 2HPO4 ○ Minato Paddy Field −
5 <80 ° C ○ ○ (NH4) 2HPO4 ○ − 1 to 50
5 <80 ° C ○ ○ (NH4) 2HPO4 × Minato Paddy 1 ~ 50
5 <80 ° C ○ ○ Orthophosphate ○ Minato Paddy 1 ~ 50
5 <80 ℃ ○ × (NH4) 2HPO4 ○ Minato Paddy 1 ~ 50
6 Indanophan ○ ○ (NH4) 2HPO4 ○ − −
6 Indanophan ○ ○ (NH4) 2HPO4 × Minato Mizuta −
6 Indanophan ○ ○ (NH4) 2HPO4 × − 1 to 50
6 Indanophan ○ ○ Orthophosphate ○ Minato Paddy Field −
6 Indanophan ○ ○ Orthophosphate ○ − 1 ~ 50
6 Indanophan ○ ○ Orthophosphate × Minamata 1 ~ 50
6 Indanophan ○ × (NH4) 2HPO4 ○ 湛 Mizuta −
6 Indanophan ○ × (NH4) 2HPO4 ○ − 1 to 50
6 Indanophan ○ × (NH4) 2HPO4 × 湛 Mizuta 1 ~ 50
6 Indanophan ○ × Orthophosphate ○ Minato Paddy 1 ~ 50
6 <65 ° C ○ ○ (NH4) 2HPO4 ○ Minato Paddy Field −
6 <65 ° C ○ ○ (NH4) 2HPO4 ○ − 1 to 50
6 <65 ° C ○ ○ (NH4) 2HPO4 × Minato Paddy 1 ~ 50
6 <65 ° C ○ ○ Orthophosphate ○ Minato Paddy 1 ~ 50
6 <65 ℃ ○ × (NH4) 2HPO4 ○ Minato Paddy 1 ~ 50
6 <80 ° C ○ ○ (NH4) 2HPO4 ○ Minato Paddy Field 1 ~ 50
―――――――――――――――――――――――――――――――――――
[0025]
[Table 5]
Table 1 (continued)
―――――――――――――――――――――――――――――――――――
No. Pesticide active ingredient Nap Lig Orthophosphate SU Field of use Diluted water amount ―――――――――――――――――――――――――――――――――――
7 Indanophan ○ ○ (NH4) 2HPO4 ○ 湛 Mizuta −
7 Indanophan ○ ○ (NH4) 2HPO4 ○ − 1 to 50
7 Indanophan ○ ○ (NH4) 2HPO4 × Mizuta 1-50
7 Indanophan ○ ○ Orthophosphate ○ 湛 Mizuta 1 ~ 50
7 Indanophan ○ × (NH4) 2HPO4 ○ 湛 Mizuta 1 ~ 50
7 <65 ° C ○ ○ (NH4) 2HPO4 ○ 湛 Mizuta 1 ~ 50
8 Indanophan ○ ○ (NH4) 2HPO4 ○ 湛 Mizuta 1 ~ 50
―――――――――――――――――――――――――――――――――――
[0026]
Hereinafter, the implementation of the present invention will be described in detail with reference to Examples, Comparative Examples, and Test Examples, but the present invention is not limited to these. In the following examples, “parts” means parts by weight.
[0027]
【Example】
[Example 1]
[0028]
[Table 6]
(1) Pyrazolsulfuron ethyl drug substance 5.92 parts
(2) Indanophan base 40.67 parts
(3) Hydrous amorphous silicon dioxide 1.26 parts
(4) Sodium salt of formalin condensate of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid 8.17 parts
(5) Sodium lignin sulfonate 5.11 parts
(6) Diammonium hydrogen phosphate 20.43 parts
(7) Clay 18.44 parts [0029]
The above components were mixed and pulverized with a jet ohmizer (manufactured by Seishin Enterprise) to obtain a powder premix A.
[0030]
[Table 7]
(8) Ammonium polyoxyethylene alkylphenyl ether sulfonate 7.38 parts
(9) Perfluoroalkyl phosphate 0.37 parts
(10) 92.25 parts of water [0031]
The said component was mixed and the liquid raw material premix B was obtained.
After putting 78.32 parts of powder premix A and 21.68 parts of liquid raw material premix B into a mixer and mixing, the mixture is granulated using an extrusion granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particles were sized with a 20-50 mesh sieve to obtain the granular wettable powder of the present invention.
[Example 2]
[0032]
[Table 8]
(1) Pyrazolsulfuron ethyl drug substance 5.92 parts
(2) Indanophan base 40.67 parts
(3) Hydrous amorphous silicon dioxide 1.26 parts
(4) Sodium salt of formalin condensate of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid 8.17 parts
(5) Diammonium hydrogen phosphate 20.43 parts
(6) Clay 23.54 parts [0033]
The above components were mixed and pulverized with a jet ohmizer (manufactured by Seishin Enterprise) to obtain a powder premix A.
[0034]
[Table 9]
(7) Ammonium polyoxyethylene alkylphenyl ether sulfonate 7.38 parts
(8) Perfluoroalkyl phosphate 0.37 parts
(9) Water 92.25 parts
The said component was mixed and the liquid raw material premix B was obtained.
After putting 78.32 parts of powder premix A and 21.68 parts of liquid raw material premix B into a mixer and mixing, the mixture is granulated using an extrusion granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particles were sized with a 20-50 mesh sieve to obtain the granular wettable powder of the present invention.
Example 3
[0036]
[Table 10]
(1) Indanophan base substance 40.67 parts
(2) Hydrous amorphous silicon dioxide 1.26 parts
(3) Sodium salt of formalin condensate of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid 8.17 parts
(4) Sodium lignin sulfonate 5.11 parts
(5) Diammonium hydrogen phosphate 20.43 parts
(6) Clay 24.36 parts
The above components were mixed and pulverized with a jet ohmizer (manufactured by Seishin Enterprise) to obtain a powder premix A.
[0038]
[Table 11]
(7) Ammonium polyoxyethylene alkylphenyl ether sulfonate 7.38 parts
(8) Perfluoroalkyl phosphate 0.37 parts
(9) Water 92.25 parts
The said component was mixed and the liquid raw material premix B was obtained.
After putting 78.32 parts of powder premix A and 21.68 parts of liquid raw material premix B into a mixer and mixing, the mixture is granulated using an extrusion granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particles were sized with a 20-50 mesh sieve to obtain the granular wettable powder of the present invention.
Example 4
[0040]
[Table 12]
(1) Indanophan base substance 40.67 parts
(2) Hydrous amorphous silicon dioxide 1.26 parts
(3) Sodium salt of formalin condensate of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid 8.17 parts
(4) Diammonium hydrogen phosphate 20.43 parts
(5) Clay 29.47 parts
The above components were mixed and pulverized with a jet ohmizer (manufactured by Seishin Enterprise) to obtain a powder premix A.
[0042]
[Table 13]
(6) Ammonium polyoxyethylene alkylphenyl ether sulfonate 7.38 parts
(7) Perfluoroalkyl phosphate 0.37 parts
(8) 92.25 parts of water [0043]
The said component was mixed and the liquid raw material premix B was obtained.
After putting 78.32 parts of powder premix A and 21.68 parts of liquid raw material premix B into a mixer and mixing, the mixture is granulated using an extrusion granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particles were sized with a 20-50 mesh sieve to obtain the granular wettable powder of the present invention.
[Comparative Example 1]
[0044]
[Table 14]
(1) Pyrazolsulfuron ethyl drug substance 5.92 parts
(2) Indanophan base 40.67 parts
(3) Hydrous amorphous silicon dioxide 1.26 parts
(4) Sodium salt of formalin condensate of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid 8.17 parts
(5) Sodium lignin sulfonate 5.11 parts
(6) Potassium chloride 20.43 parts
(7) Clay 18.44 parts [0045]
The above components were mixed and pulverized with a jet ohmizer (manufactured by Seishin Enterprise) to obtain a powder premix A.
[0046]
[Table 15]
(8) Ammonium polyoxyethylene alkylphenyl ether sulfonate 7.38 parts
(9) Perfluoroalkyl phosphate 0.37 parts
(10) 92.25 parts of water [0047]
The said component was mixed and the liquid raw material premix B was obtained.
Powder premix A 78.32 and liquid raw material premix B 21.68 are put into a mixer and mixed, and then granulated using an extrusion granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particle size was adjusted with a 20-50 mesh sieve to obtain a granular wettable powder.
[Comparative Example 2]
[0048]
[Table 16]
(1) Pyrazolsulfuron ethyl drug substance 5.92 parts
(2) Indanophan base 40.67 parts
(3) Hydrous amorphous silicon dioxide 1.26 parts
(4) Sodium salt of formalin condensate of naphthalenesulfonic acid and alkylnaphthalenesulfonic acid 8.17 parts
(5) Sodium lignin sulfonate 5.11 parts
(6) Ammonium sulfate 20.43 parts
(7) Clay 18.44 parts
The above components were mixed and pulverized with a jet ohmizer (manufactured by Seishin Enterprise) to obtain a powder premix A.
[0050]
[Table 17]
(8) Ammonium polyoxyethylene alkylphenyl ether sulfonate 7.38 parts
(9) Perfluoroalkyl phosphate 0.37 parts
(10) Water 92.25 parts
The said component was mixed and the liquid raw material premix B was obtained.
Powder premix A 78.32 and liquid raw material premix B 21.68 are put into a mixer and mixed, and then granulated using an extrusion granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particle size was adjusted with a 20-50 mesh sieve to obtain a granular wettable powder.
[0052]
[Test Example 1] 1.0 g of granular disintegrant in water disintegration test is accurately weighed. The weighed granular wettable powder is put into a 100 ml stoppered test tube containing 100 ml of 3 degree hard water placed in a constant temperature water bath at 20 ° C. After leaving still for 20 seconds, the test tube is inverted at a rate of 1 inversion every 2 seconds, and the number of inversions until the granular wettable powder completely disintegrates is made disintegratable in water. However, if the maximum number of inversions of the test tube is 20 times and the granular wettable powder does not completely disintegrate even after 20 inversions, the inversion number is 20 times or more. The smaller the number of inversions, the better the disintegration in water. The results are shown in Table-2.
[Test Example 2] Suspension stability test 1
The test tube inverted 20 times in Test Example 1 is allowed to stand, and the amount of sediment at the bottom of the test tube after 30 minutes is measured to obtain suspension stability. The smaller the amount of sediment, the better the suspension stability. The results are shown in Table-2.
[Test Example 3] Suspension stability test 2 (Test at low dilution ratio)
Accurately weigh 4.0 g of granular wettable powder. The weighed granular wettable powder is put into a 100 ml stoppered measuring cylinder containing 50 ml of 10 degree hard water (12.5 times the amount of granular wettable powder) placed in a constant temperature water bath at 20 ° C. After leaving still for 20 seconds, the graduated cylinder was inverted 30 times at a pace of inversion once every 2 seconds, and left still. After 30 minutes, 1 ml of the diluted solution was sampled with a whole pipette from the middle position of the diluted solution, the content of the pesticidal active ingredient was measured by liquid chromatography, and the suspension rate was determined by the formula (2). The closer the suspension rate is to 100%, the more uniformly suspended and the better the suspension stability. The results are shown in Table-3.
[0053]
Suspension rate (%) = (B × V / A) × 100 (2)
A: Weight of the pesticidal active ingredient in the weighed granular wettable powder B: Weight of the pesticidal active ingredient in the collected diluted solution V: Amount of diluted solution after 30 rotations (ml)
[0054]
[Table 18]

[0055]
Table 2 shows that the granular wettable powder of the present invention has good disintegration in water and suspension stability even after being stored under severe conditions of 1 month at 50 ° C. In addition, from the comparison between Examples 1 and 2 and the comparison between Examples 3 and 4, suspension stability is better when sodium lignin sulfonate is used in combination than when naphthalene sulfonic acid formalin condensate is used alone. I understand.
[0056]
[Table 19]

[0057]
Table 3 shows that the granular wettable powder of the present invention is excellent in suspension stability even when diluted with a small amount of water.
[0058]
【The invention's effect】
The granular wettable powder of the present invention does not deteriorate in water disintegration or suspension stability when diluted with water even when stored under severe conditions, and even when diluted in a small amount of water, dispersibility and suspension stability Excellent.

Claims (5)

The granular wettable powder containing the following (1)-(3).
(1) Agrochemical active ingredient having a melting point of 80 ° C or lower and a solid at 25 ° C
(2) sodium Li Guninsuruhon acid
(3) Orthophosphate The granular wettable powder containing the following (1)-(3).
(1) Agrochemical active ingredient having a melting point of 80 ° C or lower and a solid at 25 ° C
(2) Naphthalenesulfonic acid formalin condensate and sodium lignin sulfonate
(3) Orthophosphate   The granular wettable powder according to claim 1 or 2, wherein the pesticidal active ingredient of (1) has a melting point of 65 ° C or lower.   4. The granular wettable powder according to claim 1, further comprising a sulfonylurea herbicidal active ingredient in addition to the agricultural chemical active ingredient of (1).   5. The granular wettable powder according to claim 1, wherein the pesticidal active ingredient of (1) is indanophan.